CN110149012B - Low-offset-sensitivity compensation network switching control method and system for wireless power transmission system - Google Patents

Low-offset-sensitivity compensation network switching control method and system for wireless power transmission system Download PDF

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CN110149012B
CN110149012B CN201910308040.5A CN201910308040A CN110149012B CN 110149012 B CN110149012 B CN 110149012B CN 201910308040 A CN201910308040 A CN 201910308040A CN 110149012 B CN110149012 B CN 110149012B
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compensation network
wireless power
power transmission
lcc
current value
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CN110149012A (en
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王松岑
吴晓康
徐翀
魏斌
谭林林
张振兴
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Southeast University
China Electric Power Research Institute Co Ltd CEPRI
State Grid Hubei Electric Power Co Ltd
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Southeast University
China Electric Power Research Institute Co Ltd CEPRI
State Grid Hubei Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

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  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
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Abstract

The invention discloses a method and a system for controlling the switching of a compensation network of a wireless power transmission system with low offset sensitivity, wherein the method comprises the following steps: respectively determining first transmission efficiency and second transmission efficiency of the inverter output under the S-S compensation network state and the LCC-LCC compensation network state; calculating the offset mutual inductance of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal; respectively determining fundamental wave current effective values output by the inverter under the S-S compensation network state and the LCC-LCC compensation network state according to the offset mutual inductance; the method comprises the steps of obtaining a real-time current value output by an inverter of the wireless power transmission system under the current state of obtaining a compensation network, and carrying out switching control on the compensation network of the wireless power transmission system according to a preset control strategy. The invention can realize that the wireless power transmission system has better transmission efficiency in the whole offset process, and can effectively reduce the offset sensitivity of the transmission efficiency of the wireless power transmission system on the premise of reasonably controlling the cost.

Description

Low-offset-sensitivity compensation network switching control method and system for wireless power transmission system
Technical Field
The present invention relates to the field of wireless power transmission technologies, and in particular, to a method and a system for controlling a compensation network handover of a wireless power transmission system with low offset sensitivity.
Background
The magnetic coupling resonance type wireless power transmission technology is a technology for realizing power transmission from a power supply side to a load side by means of a magnetic field in a physical space based on a non-conductive contact mode. The wireless power transmission technology of the patent refers in particular to a magnetic coupling resonant wireless power transmission technology. In recent years, wireless power transmission technology is rapidly developed, and compared with the traditional wired charging mode, the wireless charging mode does not need frequent operation, and can avoid electric leakage accidents caused by mechanical friction of plugs and sockets. With the continuous and deep research and application, the wireless power transmission technology has been widely applied to the fields of electric vehicles, consumer electronics, medical instruments, illumination, automated manufacturing equipment and the like. The wireless power transmission technology is applied to charging of the electric automobile, has important significance on popularization of the electric automobile, has revolutionary influence on the charging mode of the existing electric automobile, and is the most effective and convenient way for achieving unmanned intelligent charging especially along with development of unmanned electric automobiles in the future. Only need reform transform current parking stall, need not additionally to build a large amount of electric piles that fill, both practiced thrift a large amount of land resources, reduced charging device operation cost and later maintenance cost etc. again, greatly improved flexibility, convenience and the reliability that electric automobile used simultaneously.
In the wireless charging application of the electric automobile, the offset between the vehicle-mounted receiving coil and the transmitting coil inevitably changes due to the change of the parking position. When an offset is generated between the transmitting and receiving coils, the transmission efficiency of the wireless power transmission system inevitably varies. The transmission efficiency as a key parameter of the wireless power transmission system should be kept relatively stable, so that the wireless charging system of the electric vehicle must have a wider effective offset range, that is, when the transmitting coil and the receiving coil are changed within a certain range, the transmission efficiency does not fluctuate greatly along with the offset of the coils.
In the existing wireless power transmission technology of the electric automobile, when different compensation networks are adopted, the transmission efficiency characteristics are different in the offset state, and the higher transmission efficiency is difficult to maintain in the whole offset process by singly using a certain compensation network. At present, a compensation network regulation and control method capable of maintaining high transmission efficiency when an electric vehicle wireless power transmission system works in different offset states does not exist.
Disclosure of Invention
The invention provides a method and a system for controlling the switching of a compensation network of a wireless power transmission system with low offset sensitivity, which are used for solving the problem of how to control the switching method of the compensation network so as to maintain high transmission efficiency when the wireless power transmission system works in different offset states.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for compensating network handover control in a wireless power transmission system with low offset sensitivity, the method comprising:
determining a first transmission efficiency output by an inverter in an S-S compensation network state according to a wireless power transmission system in the S-S compensation network state;
determining a second transmission efficiency output by the inverter under the LCC-LCC compensation network state according to the wireless power transmission system under the LCC-LCC compensation network state;
calculating the offset mutual inductance of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal;
respectively determining effective values of fundamental wave currents output by an inverter under an S-S compensation network state and an LCC-LCC compensation network state according to the offset mutual inductance, wherein the effective values are a first current value and a second current value;
the method comprises the steps of obtaining a real-time current value output by an inverter of the wireless power transmission system under the state that a compensation network is obtained currently, comparing the real-time current value, the first current value, the second current value and the current value of a zone bit with a preset control strategy, and carrying out switching control on the compensation network of the wireless power transmission system according to a comparison result.
Preferably, comparing the real-time current value, the first current value, the second current value, and the current flag bit value with a preset control strategy, and performing switching control on a compensation network of the wireless power transmission system according to a comparison result, includes:
if the flag bit value is 0, and the real-time current value is less than or equal to a first current value; or if the flag bit value is 1 and the real-time current value is less than or equal to a second current value, controlling the wireless power transmission system to work in an S-S compensation network state, and keeping the flag bit value unchanged;
if the flag bit value is 0 and the real-time current value is greater than the first current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 1;
and if the flag bit value is 1 and the real-time current value is greater than the second current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 0.
Preferably, wherein the method further comprises:
setting the initial working state of the wireless power transmission system as an S-S compensation network state, and initializing the value of a zone bit to be 0.
Preferably, the performing switching control on the compensation network of the wireless power transmission system according to the comparison result includes:
switching and controlling a compensation network by using a compensation network control circuit in the wireless power transmission system according to the comparison result; wherein the compensation network control circuit comprises: the system comprises a transmitting end compensation network element, a receiving end compensation network element, a current detection module, a micro control module, a communication module, a transmitting end compensation network state switching relay module and a receiving end compensation network state switching relay module.
Preferably, wherein the wireless power transmission system further comprises: the transmitter comprises a transmitter direct current source, a transmitter high-frequency inverter circuit, a transmitter coil, a receiver rectification filter circuit and a load which are connected in sequence.
According to another aspect of the present invention, there is provided a low offset sensitivity radio power transmission system compensation network switching control system, comprising:
the first transmission efficiency determining unit is used for determining a first current phasor and a first transmission efficiency output by the inverter under the S-S compensation network state according to the wireless power transmission system under the S-S compensation network state;
the second transmission efficiency determining unit is used for determining a second current phasor and second transmission efficiency output by the inverter under the LCC-LCC compensation network state according to the wireless power transmission system under the LCC-LCC compensation network state;
the offset mutual inductance calculation unit is used for calculating offset mutual inductance of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal;
the current value determining unit is used for respectively determining fundamental wave current effective values output by the inverter under the S-S compensation network state and the LCC-LCC compensation network state according to the offset mutual inductance, wherein the fundamental wave current effective values are respectively a first current value and a second current value;
and the compensation network switching control unit is used for acquiring a real-time current value output by the inverter of the wireless power transmission system under the current compensation network state, comparing the real-time current value, the first current value, the second current value and the current zone bit value with a preset control strategy, and switching and controlling the compensation network of the wireless power transmission system according to the comparison result.
Preferably, the comparing, by the compensation network switching control unit, the real-time current value, the first current value, the second current value, and the current flag bit value with a preset control policy, and performing switching control on the compensation network of the wireless power transmission system according to a comparison result includes:
if the flag bit value is 0, and the real-time current value is less than or equal to a first current value; or if the flag bit value is 1 and the real-time current value is less than or equal to a second current value, controlling the wireless power transmission system to work in an S-S compensation network state, and keeping the flag bit value unchanged;
if the flag bit value is 0 and the real-time current value is greater than the first current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 1;
and if the flag bit value is 1 and the real-time current value is greater than the second current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 0.
Preferably, wherein the system further comprises:
setting the initial working state of the wireless power transmission system as an S-S compensation network state, and initializing the value of a zone bit to be 0.
Preferably, the switching control unit of the compensation network, according to the comparison result, performs switching control on the compensation network of the wireless power transmission system, including:
switching and controlling a compensation network by using a compensation network control circuit in the wireless power transmission system according to the comparison result; wherein the compensation network control circuit comprises: the system comprises a transmitting end compensation network element, a receiving end compensation network element, a current detection module, a micro control module, a communication module, a transmitting end compensation network state switching relay module and a receiving end compensation network state switching relay module.
Preferably, wherein the wireless power transmission system further comprises: the transmitter comprises a transmitter direct current source, a transmitter high-frequency inverter circuit, a transmitter coil, a receiver rectification filter circuit and a load which are connected in sequence.
The invention provides a method and a system for controlling the switching of a compensation network of a wireless power transmission system with low offset sensitivity, which comprises the following steps: respectively determining first transmission efficiency and second transmission efficiency of the inverter output under the S-S compensation network state and the LCC-LCC compensation network state; calculating the offset mutual inductance of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal; respectively determining effective values of fundamental wave currents output by an inverter under an S-S compensation network state and an LCC-LCC compensation network state according to the offset mutual inductance, wherein the effective values are a first current value and a second current value; the method comprises the steps of obtaining a real-time current value output by an inverter of the wireless power transmission system under the current state of obtaining a compensation network, and carrying out switching control on the compensation network of the wireless power transmission system according to a preset control strategy. The compensation network switching control method provided by the invention is simple and feasible, the offset state of the wireless power transmission system can be determined only by monitoring the effective value condition of the fundamental current output by the inverter of the wireless power transmission system in real time, and the compensation network structure of the system is automatically switched according to the offset state of the wireless power transmission system, so that the wireless power transmission system has better transmission efficiency in the whole offset process, and the offset sensitivity of the transmission efficiency of the wireless power transmission system can be effectively reduced on the premise of reasonably controlling the cost; meanwhile, the structure of the wireless power transmission system is flexible, a proper compensation structure can be selected according to the working conditions of the actual wireless power transmission system, and the later-period improvement and maintenance cost can be effectively controlled.
Drawings
Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
fig. 1 is a flow chart of a method 100 for compensating network handover in a wireless power transmission system with low offset sensitivity according to an embodiment of the present invention;
fig. 2 is a circuit model diagram of a wireless power transmission system operating in an S-S compensation network state according to an embodiment of the present invention;
fig. 3 is a circuit model diagram of a wireless power transmission system operating in an LCC-LCC compensation network state according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a wireless power transmission system according to an embodiment of the present invention;
FIG. 5 is a flow chart of controlling a compensating network state switch according to an embodiment of the present invention; and
fig. 6 is a schematic diagram illustrating a compensating network handover control system 600 of a wireless power transmission system with low offset sensitivity according to an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method 100 for compensating network handover in a wireless power transmission system with low offset sensitivity according to an embodiment of the present invention. As shown in fig. 1, the method for controlling switching of the compensation network of the wireless power transmission system with low offset sensitivity according to the embodiment of the present invention is simple and easy to implement, the offset state of the wireless power transmission system can be determined only by monitoring the effective value of the fundamental current output by the inverter of the wireless power transmission system in real time, and the compensation network structure of the system can be automatically switched according to the offset state of the wireless power transmission system, so that the wireless power transmission system has better transmission efficiency in the whole offset process, and the offset sensitivity of the transmission efficiency of the wireless power transmission system can be effectively reduced on the premise of reasonably controlling the cost; meanwhile, the structure of the wireless power transmission system is flexible, a proper compensation structure can be selected according to the working conditions of the actual wireless power transmission system, and the later-period improvement and maintenance cost can be effectively controlled. The embodiment of the invention provides a method 100 for controlling switching of a compensation network of a wireless power transmission system with low offset sensitivity, which starts from step 101, and determines a first transmission efficiency of an inverter output in an S-S compensation network state according to the wireless power transmission system in the S-S compensation network state in step 101.
Fig. 2 is a circuit model diagram of a wireless power transmission system operating in an S-S compensation network state according to an embodiment of the present invention. As shown in FIG. 2, U1For the inverter to output voltage phasors, I1-SFor the inverter output current phasor, U, in the S-S compensation network state2-SCompensating the load voltage phasor in the network state for S-S, I2-SCompensating the load current phasor, Z, in the network state for S-Sin-SCompensating the input impedance of the system in the network state for S-S, Ct-SCompensating the capacitance value, C, of the transmitting terminal in the S-S compensation network states-SCompensating capacitance value, L, of receiving end in S-S compensation network statetAs the inductance value of the transmitting end coil, LsFor receiving the inductance value of the coil, RtAs the resistance value of the transmitting end coil, RsFor receiving the resistance value of the coil, RLM is mutual inductance between the coils at the receiving end of the transmitting end.
When the system is in a full resonance state, the following conditions are satisfied:
Figure BDA0002030494960000071
where ω is the system resonance angular frequency.
Knowing the inverter output current phasor I under the S-S compensation network state1-SComprises the following steps:
Figure BDA0002030494960000072
as can be seen, the first transmission efficiency η of the system under the S-S compensation network statesComprises the following steps:
Figure BDA0002030494960000073
in step 102, a second transmission efficiency output by the inverter in the LCC-LCC compensation network state is determined according to the wireless power transmission system in the LCC-LCC compensation network state.
Fig. 3 is a circuit model diagram of a wireless power transmission system operating in an LCC-LCC compensation network state according to an embodiment of the present invention. As shown in FIG. 3, U1Is output of an inverterVoltage phasor, I1-LCCCompensating the inverter output current phasor, U, for the LCC-LCC network state2-LCCCompensating the load voltage phasor in the network state for LCC-LCC2-LCCCompensating the load current phasor in the network state for LCC-LCCt-LCCFor compensating the phasor of the current flowing through the coil of the transmitting terminal in the network state for LCC-LCCs-LCCCompensating the phasor of the current flowing through the coil at the receiving end in the network state for LCC-LCCin-LCCCompensating the input impedance of the system in the network state for LCC-LCC, Z22-LCCCompensating the input impedance, C, of the receiving end of the system in the network state for LCC-LCCt-LCCCompensating the capacitance value, C, of the transmitting end in the LCC-LCC compensation network states-LCCCompensating the capacitance value, C, of the receiving end in the LCC-LCC compensation network state1-LCCCompensating the capacitance value, C, of the transmitting terminal in the LCC-LCC compensation network state2-LCCCompensating the capacitance value, L, of the receiving end for the LCC-LCC compensation network state1-LCCCompensating the inductance value, L, of the transmitting end in the LCC-LCC compensation network state2-LCCCompensating inductance values, R, for the receiving end in LCC-LCC compensation network state1-LCCCompensating the inductance resistance value R of the transmitting terminal in the LCC-LCC compensation network state2-LCCCompensating the inductance resistance value L of the receiving end in the LCC-LCC compensation network statetAs the inductance value of the transmitting end coil, LsFor receiving the inductance value of the coil, RtIs the resistance value of the transmitting end coil, RsFor receiving the resistance value of the coil, RLM is mutual inductance between the coils at the receiving end of the transmitting end.
When the system is in a full resonance state, the following conditions are satisfied:
Figure BDA0002030494960000081
where ω is the system resonance angular frequency.
It can be seen that the reflected impedance Z of the systemref-LCCComprises the following steps:
Figure BDA0002030494960000082
it can be known that the inverter output current phasor I is in the LCC-LCC compensation network state1-LCCComprises the following steps:
Figure BDA0002030494960000083
therefore, it can be known that the second transmission efficiency of the system in the LCC-LCC compensation network state is:
Figure BDA0002030494960000084
in step 103, the offset mutual inductance of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal is calculated.
In the embodiment of the invention, the mutual inductance between the transceiver coils is M when the transceiver coils are in a positive state0When the receiving and transmitting coils are in the maximum offset state, the mutual inductance between the receiving and transmitting coils is M1The mutual inductance between the receiving and transmitting coils at a certain position is set to be MkThen there is M1≤Mk≤M0。
For the wireless power transmission system adopting the same transceiver coil, the transceiver end compensation network has symmetrical parameters, the equivalent load is the same, the DC side voltage of the inverter is the same, the working frequency is the same, and the output power is the same when the transceiver coil is over against, the offset mutual inductance of the transceiver coil is set to be McIn time, the transmission efficiency of the system under the two compensation network states is equal, and the corresponding transmission efficiency is etacSetting:
Figure BDA0002030494960000091
then, the offset mutual inductance M of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal can be calculatedcComprises the following steps:
Figure BDA0002030494960000092
wherein α ═ C2Fω8，β＝CD(E+FG)ω6-Bω2，γ＝D2EGω4-A。
In step 104, effective values of fundamental current output by the inverter under the S-S compensation network state and the LCC-LCC compensation network state are respectively determined according to the offset mutual inductance and are respectively a first current value and a second current value.
In the embodiment of the present invention, the mutual inductance value M is obtainedcAnd the inverter output current phasor I under the determined S-S compensation network state1-SAnd the inverter output current phasor I under the LCC-LCC compensation network state1-LCCThe effective value of the fundamental wave current output by the inverter of the S-S compensation network system at this time, that is, the magnitude of the first current value, can be determined as follows:
Figure BDA0002030494960000093
the LCC-LCC compensation network system inverter outputs a fundamental wave current effective value, namely the magnitude of a second current value is as follows:
Figure BDA0002030494960000101
in step 105, a real-time current value output by the inverter when the wireless power transmission system currently obtains the compensation network state is obtained, the real-time current value, the first current value, the second current value and the current flag bit value are compared with a preset control strategy, and the compensation network of the wireless power transmission system is switched and controlled according to a comparison result.
Preferably, the comparing the real-time current value, the first current value, the second current value, and the current flag bit value with a preset control strategy, and performing switching control on a compensation network of the wireless power transmission system according to a comparison result includes:
if the flag bit value is 0, and the real-time current value is less than or equal to a first current value; or if the flag bit value is 1 and the real-time current value is less than or equal to a second current value, controlling the wireless power transmission system to work in an S-S compensation network state, and keeping the flag bit value unchanged;
if the flag bit value is 0 and the real-time current value is greater than the first current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 1;
and if the flag bit value is 1 and the real-time current value is greater than the second current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 0.
Preferably, wherein the method further comprises:
setting the initial working state of the wireless power transmission system as an S-S compensation network state, and initializing the value of a zone bit to be 0.
Preferably, the performing switching control on the compensation network of the wireless power transmission system according to the comparison result includes:
switching and controlling a compensation network by using a compensation network control circuit in the wireless power transmission system according to the comparison result; wherein the compensation network control circuit comprises: the system comprises a transmitting end compensation network element, a receiving end compensation network element, a current detection module, a micro control module, a communication module, a transmitting end compensation network state switching relay module and a receiving end compensation network state switching relay module.
Preferably, wherein the wireless power transmission system further comprises: the transmitter comprises a transmitter direct current source, a transmitter high-frequency inverter circuit, a transmitter coil, a receiver rectification filter circuit and a load which are connected in sequence.
Fig. 4 is a circuit diagram of a wireless power transmission system according to an embodiment of the present invention. As shown in fig. 4, in an embodiment of the present invention, a wireless power transmission system includes: transmitting end direct current source 1, transmitting end high-frequency inverter circuit 2, transmitting coil 3, receiving coil 4 and receiving end rectifierA flow filter circuit 5, a load 6 and a compensation network control circuit 7. The compensation network control circuit 7 includes: a transmitting terminal compensation network element 101, a receiving terminal network compensation element 102, a current detection module 103, a Micro Control Unit (MCU)104, a communication module 105, a transmitting terminal compensation network switching relay module 106, and a receiving terminal compensation network switching relay module 107; wherein the transmitting end compensating network element 101 comprises: S-S compensation network transmitting terminal compensation capacitor Ct-SLCC-LCC compensation network transmitting end compensation capacitor Ct-LCCLCC-LCC compensation network transmitting end compensation capacitor C1-LCCAnd LCC-LCC compensation network transmitting terminal compensation inductance L1-LCC(ii) a The receiving-end network compensation element 102 includes: S-S compensation network receiving end compensation capacitor Cs-SLCC-LCC compensation network receiving end compensation capacitor Cs-LCCLCC-LCC compensation network receiving end compensation capacitor C2-LCCAnd LCC-LCC compensation network receiving end compensation inductance L2-LCC(ii) a The transmitter side compensation network switching relay module 106 includes: relay Sp1、Sp2、Sp3And Sp4(ii) a The receiving end compensation network switching relay module 107 includes: relay Ss1、Ss2、Ss3And Ss4。
Fig. 5 is a flow chart of controlling a compensating network state switch according to an embodiment of the present invention. As shown in fig. 5, the embodiment of the present invention includes the following steps when performing the compensation network state switching:
(1) initialization of the system, using the micro-control module 104 to control the transmitter compensation network to switch the relay S of the relay module 106P1And SP4Closed, relay S of the receiver compensation network switching relay module 107 is controlled by means of the communication module 105s1And Ss4Close, control the transmitter compensation network to switch the relay S of the relay module 106P2And SP3The relay S of the receiving end compensation network switching relay module 107 is controlled by the communication module 105 to be switched offs2And Ss3And (4) disconnecting, enabling the system to work in an S-S compensation network state, and setting the flag bit F to be 0.
(2) And judging whether the flag bit F is 0, if so, switching to the step 3, and if not, switching to the step 5.
(3) The current detection module 103 detects the effective value I1 of the fundamental current output by the inverter.
(4) When I1 is less than or equal to Ic-S(first current value), the micro-control module 104 is used to control the transmitter compensation network to switch the relay S of the relay module 106P1、SP4Closed, relay S of the receiver compensation network switching relay module 107 is controlled by means of the communication module 105s1And Ss4Close, control the transmitter compensation network to switch the relay S of the relay module 106P2And SP3The relay S of the receiving end compensation network switching relay module 107 is controlled by the communication module 105 to be switched offs2And Ss3Disconnecting to enable the system to work in an S-S compensation network state, and returning to the step 2 after setting the flag bit F to be 0; when I is1＞Ic-SThen, the micro-control module 104 is used to control the transmitter compensation network to switch the relay S of the relay module 106P1And SP4The relay S of the receiving end compensation network switching relay module 107 is controlled by the communication module 105 to be switched offs1And Ss4Relay S of the switch relay module 106 for switching off and controlling the transmitter compensation networkP2And SP3Closed, relay S of the receiver compensation network switching relay module 107 is controlled by means of the communication module 105s2And Ss3And closing, enabling the system to work in an LCC-LCC compensation network state, and returning to the step 2 after setting the flag bit F to be 1.
(5) When I is1≤Ic-LCC(second current value), the micro-control module 104 is used to control the transmitter compensation network to switch the relay S of the relay module 106P1And SP4And the relay S of the receiving end compensation network switching relay module 107 is controlled by the communication module 105 to be disconnecteds1And Ss4Relay S of relay module 106 is switched off and controlled to compensate network switching at transmitting terminalP2And SP3Closed, relay S of the receiver compensation network switching relay module 107 is controlled by means of the communication module 105s2And Ss3Closing to make the system work in LCC-LCC compensation network shapeAnd returning to the step 2 after setting the flag bit F to be 1; when I is1＞Ic-LCCThen, the micro-control module 104 is used to control the transmitter compensation network to switch the relay S of the relay module 106P1And SP4Closed, relay S of the receiver compensation network switching relay module 107 is controlled by means of the communication module 105s1And Ss4Close, control the transmitter compensation network to switch the relay S of the relay module 106P2And SP3The relay S of the receiving end compensation network switching relay module 107 is controlled by the communication module 105 to be switched offs2And Ss3And (4) disconnecting the system to enable the system to work in an S-S compensation network state, and returning to the step 2 after the flag bit F is set to be 0.
According to the technical scheme provided by the embodiment of the invention, the offset state of the wireless power transmission system can be determined only by monitoring the effective value condition of the fundamental wave current output by the inverter in the wireless power transmission system in real time, and the compensation network structure of the system is automatically switched according to the offset state of the wireless power transmission system, so that the wireless power transmission system has better transmission efficiency in the whole offset process.
The technical scheme provided by the embodiment of the invention can be applied to various wireless power transmission systems, such as wireless power transmission systems of electric automobiles.
The circuit diagram in the embodiment of the invention is only for illustrating the technical idea of the invention, and the protection scope of the invention is not limited thereby, and any modification made on the basis of the technical scheme according to the technical idea of the invention falls within the protection scope of the invention.
Fig. 6 is a schematic diagram illustrating a compensating network handover control system 600 of a wireless power transmission system with low offset sensitivity according to an embodiment of the invention. As shown in fig. 6, a system 600 for compensating network handover in a wireless power transmission system with low offset sensitivity according to an embodiment of the present invention includes: a first transmission efficiency determination unit 601, a second transmission efficiency determination unit 602, an offset mutual inductance calculation unit 603, a current value determination unit 604, and a compensation network switching control unit 605.
Preferably, the first transmission efficiency determining unit 601 is configured to determine a first current phasor and a first transmission efficiency output by the inverter in the S-S compensation network state according to the wireless power transmission system in the S-S compensation network state.
Preferably, the second transmission efficiency determining unit 602 is configured to determine a second current phasor and a second transmission efficiency output by the inverter in the LCC-LCC compensation network state according to the wireless power transmission system in the LCC-LCC compensation network state.
Preferably, the offset mutual inductance calculating unit 603 is configured to calculate offset mutual inductances of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal.
Preferably, the current value determining unit 604 is configured to determine effective values of fundamental currents output by the inverters in the S-S compensation network state and the LCC-LCC compensation network state respectively as a first current value and a second current value according to the offset mutual inductance.
Preferably, the compensation network switching control unit 605 is configured to obtain a real-time current value output by the inverter when the wireless power transmission system currently obtains the compensation network state, compare the real-time current value, the first current value, the second current value, and the current flag value with a preset control policy, and perform switching control on the compensation network of the wireless power transmission system according to a comparison result.
Preferably, the compensation network switching control unit 605 compares the real-time current value, the first current value, the second current value and the current flag bit value with a preset control strategy, and performs switching control on the compensation network of the wireless power transmission system according to the comparison result, where the comparison result includes that if the flag bit value is 0, and the real-time current value is less than or equal to the first current value; or if the flag bit value is 1 and the real-time current value is less than or equal to a second current value, controlling the wireless power transmission system to work in an S-S compensation network state, and keeping the flag bit value unchanged; if the flag bit value is 0 and the real-time current value is greater than the first current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 1; and if the flag bit value is 1 and the real-time current value is greater than the second current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 0.
Preferably, wherein the system further comprises: and setting the initial working state of the wireless power transmission system as a compensation network state, and initializing the value of the flag bit to be 0.
Preferably, the switching control unit 605 of the compensation network switches the compensation network of the wireless power transmission system according to the comparison result, including: switching and controlling a compensation network by using a compensation network control circuit in the wireless power transmission system according to the comparison result; wherein the compensation network control circuit comprises: the system comprises a transmitting end compensation network element, a receiving end compensation network element, a current detection module, a micro control module, a communication module, a transmitting end compensation network state switching relay module and a receiving end compensation network state switching relay module.
Preferably, wherein the wireless power transmission system further comprises: the transmitter comprises a transmitter direct current source, a transmitter high-frequency inverter circuit, a transmitter coil, a receiver rectification filter circuit and a load which are connected in sequence.
The system 600 for controlling switching of a compensation network of a wireless power transmission system with low offset sensitivity of the embodiment of the present invention corresponds to the method 100 for controlling switching of a compensation network of a wireless power transmission system with low offset sensitivity of the other embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the ones disclosed above are equally possible within the scope of these appended patent claims, as these are known to those skilled in the art.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (8)

1. A method for controlling network handover compensation of a wireless power transmission system with low offset sensitivity, the method comprising:
determining a first transmission efficiency output by an inverter in an S-S compensation network state according to a wireless power transmission system in the S-S compensation network state;
determining a second transmission efficiency output by the inverter under the LCC-LCC compensation network state according to the wireless power transmission system under the LCC-LCC compensation network state;
calculating the offset mutual inductance of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal;
respectively determining effective values of fundamental wave currents output by an inverter under an S-S compensation network state and an LCC-LCC compensation network state according to the offset mutual inductance, wherein the effective values are a first current value and a second current value;
acquiring a real-time current value output by an inverter of a wireless power transmission system in a state of currently obtaining a compensation network, comparing the real-time current value, the first current value, the second current value and the current value of a flag bit with a preset control strategy, and performing switching control on the compensation network of the wireless power transmission system according to a comparison result;
wherein the method further comprises:
setting the initial working state of the wireless power transmission system as an S-S compensation network state, and initializing the value of a zone bit to be 0.
2. The method of claim 1, wherein comparing the real-time current value, the first current value, the second current value, and the current flag bit value with a preset control strategy, and performing switching control on a compensation network of the wireless power transmission system according to a comparison result comprises:
if the flag bit value is 0, and the real-time current value is less than or equal to a first current value; or if the flag bit value is 1 and the real-time current value is less than or equal to a second current value, controlling the wireless power transmission system to work in an S-S compensation network state, and keeping the flag bit value unchanged;
if the flag bit value is 0 and the real-time current value is greater than the first current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 1;
and if the flag bit value is 1 and the real-time current value is greater than the second current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 0.
3. The method according to claim 1, wherein the performing switching control on the compensation network of the wireless power transmission system according to the comparison result comprises:
switching and controlling a compensation network by using a compensation network control circuit in the wireless power transmission system according to the comparison result; wherein, the compensation network control circuit includes: the system comprises a transmitting end compensation network element, a receiving end compensation network element, a current detection module, a micro control module, a communication module, a transmitting end compensation network state switching relay module and a receiving end compensation network state switching relay module.
4. The method of claim 3, wherein the wireless power transfer system further comprises: the transmitter comprises a transmitter direct current source, a transmitter high-frequency inverter circuit, a transmitter coil, a receiver rectification filter circuit and a load which are connected in sequence.
5. A system for compensating network switching control in a wireless power transfer system with low offset sensitivity, the system comprising:
the first transmission efficiency determining unit is used for determining a first current phasor and a first transmission efficiency output by the inverter under the S-S compensation network state according to the wireless power transmission system under the S-S compensation network state;
the second transmission efficiency determining unit is used for determining a second current phasor and a second transmission efficiency output by the inverter under the LCC-LCC compensation network state according to the wireless power transmission system under the LCC-LCC compensation network state;
the offset mutual inductance calculation unit is used for calculating offset mutual inductance of the receiving coil and the transmitting coil when the first transmission efficiency and the second transmission efficiency are equal;
the current value determining unit is used for respectively determining fundamental wave current effective values output by the inverter under an S-S compensation network state and an LCC-LCC compensation network state according to the offset mutual inductance, wherein the fundamental wave current effective values are respectively a first current value and a second current value;
the compensation network switching control unit is used for acquiring a real-time current value output by an inverter of the wireless power transmission system in a current compensation network state, comparing the real-time current value, the first current value, the second current value and a current zone bit value with a preset control strategy, and performing switching control on a compensation network of the wireless power transmission system according to a comparison result;
wherein the system further comprises:
setting the initial working state of the wireless power transmission system as a compensation network state, and initializing the value of the zone bit to be 0.
6. The system of claim 5, wherein the compensation network switching control unit compares the real-time current value, the first current value, the second current value, and the current flag bit value with a preset control policy, and performs switching control on the compensation network of the wireless power transmission system according to the comparison result, and the switching control method comprises:
if the flag bit value is 0, and the real-time current value is less than or equal to a first current value; or if the flag bit value is 1 and the real-time current value is less than or equal to a second current value, controlling the wireless power transmission system to work in an S-S compensation network state, and keeping the flag bit value unchanged;
if the flag bit value is 0 and the real-time current value is greater than the first current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state, and resetting the flag bit value to be 1;
and if the flag bit value is 1 and the real-time current value is greater than the second current value, controlling the wireless power transmission system to work in an LCC-LCC compensation network state and resetting the flag bit value to be 0.
7. The system of claim 5, wherein the compensation network switching control unit performs switching control on the compensation network of the wireless power transmission system according to the comparison result, and comprises:
switching control is carried out on a compensation network by utilizing a compensation network control circuit in the wireless power transmission system according to a comparison result; wherein the compensation network control circuit comprises: the system comprises a transmitting end compensation network element, a receiving end compensation network element, a current detection module, a micro control module, a communication module, a transmitting end compensation network state switching relay module and a receiving end compensation network state switching relay module.
8. The system of claim 7, wherein the wireless power transfer system further comprises: the transmitter comprises a transmitter direct current source, a transmitter high-frequency inverter circuit, a transmitter coil, a receiver rectification filter circuit and a load which are connected in sequence.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109474082A (en) * 2018-12-07 2019-03-15 华中科技大学 A kind of bidirectional radio energy Transmission system and method based on change compensation network structure
CN109617190A (en) * 2019-01-15 2019-04-12 东南大学 It can anti-offset battery wireless charging system based on constant current-constant pressure Compound Topology

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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US10144301B2 (en) * 2016-02-18 2018-12-04 Denso International America, Inc. Optimized compensation coils for wireless power transfer system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109474082A (en) * 2018-12-07 2019-03-15 华中科技大学 A kind of bidirectional radio energy Transmission system and method based on change compensation network structure
CN109617190A (en) * 2019-01-15 2019-04-12 东南大学 It can anti-offset battery wireless charging system based on constant current-constant pressure Compound Topology

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